Commutator-truing machine.



0. B. HUNT.

GOMMUTATOR TBUING MACHINE.

APPLICATION FILED NOV. 13, 1908.

I 945,784.. Patented Jan. 11,1910.

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4 0. E. HUNT. GOMMUTA'I'OR TRUING MAGHINE.

APPLICATION FILED NOV. 13. 1908.

945,784 Panefited Janfu, 1910.

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OSlVIAN E. HUNT, OF EAGLE GROVE, IOWA.

COMMU'LATOE-TR-UING IMACI-IINE.

Application filed November 13, 1908.

To all whom it may concern:

Be it known that I, OSMAN E. HUNT, a citizen of the United States,residing at Eagle Grove, in the county of Wright and State of Iowa, haveinvented certain new and useful Improvements in commutator- TruingMachines, of which the following is a specification.

The purpose of this invention is to supply a machine of novel structurefor truing the commutators of dynamo-electric machines and which may beused without necessitating removal of the commutator from its shaft orthe dismounting of the dynamoelectric machine thereby enabling thecommutator to be trued in a comparatively short length of time and at aminimum expense.

in using the appliance in connection with a dynamo, the power of themachine may be employed for running the same, or when the truing machineis fitted to a motor the latter may be turned by means of a crankapplied to the shaft.

While the invention may be adapted to different forms and conditions bychanges in the structure and minor details without departing from thespirit or essential features thereof, still the preferred embodiment isshown in the accompanying drawings.

For a full understanding of the invention and the merits thereof andalso to acquire a knowledge of the details of construction, of the meansfor effecting the result, reference is to be had to the followingdescription and accompanying drawings in which:

Figure 1 is a side View of a dynamo having the invention in operativeposition, the brushes being removed and the machine placed in positionfor truing the commutator. Fig. 2 is a perspective view of the supportincluding the two uprights and the tie. Fig. 3 is a detail perspectiveview of the head, guide and carriage, having the cutting tool in placeand illustrating the several rods, and the upper ends of the support.Fig. 4t is a central longitudinal section of the carriage showing theguide and supporting head also in section. Fig. 5 is a transversesection on the line 55 of Fig. 4, looking to the left, the upper portionof the tool post being broken away.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

Specification of Letters Patent.

Patented Jan. 11, 1910.

Serial No. 462,487.

The machine comprises uprights 1 which are extensible to admit ofreadily adapting the machine to the dynamo or electric motor whosearmature is to be trued or made smooth. The uprights 1 consist of lowermembers 2, upper members 3 and turn buckles 4, the latter adjustablyconnecting the members 2 and 3. The upper members 3 are adjustablyconnected by means of a tie rod 5, the latter having its end portionsthreaded, and passed through openings in the members 3 and provided witha pair of set nuts 6. The members 3 are provided at their upper endswith sleeves 7 in which rods 8 are mounted so as to turn and movelongitudinally to any required position, set screws t) threaded intoopenings in the sides of the sleeves 7 and serving to secure the rods 8in the adjusted position. Each of the rods 8 is provided at one end withan arm 10 having an opening 11 to receive a bolt or fastening 12, bymeans of which the machine is attached to the dynamo-electric machine.

A coupling 13 is mounted upon one of the rods 8 and is provided at itsends with openings having a right-angular arrangement, one of theopenings 14 receiving a rod 8 and the other opening receiving a rod 16.Set screws 17 and 18, threaded into opposite ends of the coupling serveto secure the rods 8 and 16 in the adjusted position. The rod 16 isprovided at one end with a head 19 which receives the other rod 8, thelatter being adjustably connected thereto by means of a hook or eye-bolt20. A groove or channel 21 is formed in the head 19 and forms a seat toreceive the rod 8 which is held therein at the required adjustedposition by means of the hook or eye bolt 20. The arms 10 at the ends ofthe rods 8 serve to connect the machine to the dynamo or electric motor,the uprights 1 bracing and supporting the rod 16 which is provided atone end with the connecting mechanism.

A guide 22 is mounted upon the head 19 and is adjustable thereon beingsecured in place by means of machine screws The guide 22 supports acarriage 24 which is slidable upon the guide being moved backward andforward by means of a feed screw 25 which is connected with one end ofthe carriage 24 by means of a swivel connection and has screw threadconnection with a lug 26 secured to the guide 22. The carriage 24 has adove tail connection with the guide 22 so as to prevent both verticaland lateral displacement. A plate 27 is interposed between a side of thecarriage 24: and the guide 22 and is adjustable by means of set screws28 so as to take up wear and insure a snug fit between the guide and thecarriage so as to prevent any possible play. A tool post 29 is mountedupon the carriage 2a and is adapted to be secured thereon in any adjusted position either angularly or in the length of the carriage. Thecutting tool 30 is passed through the slot of the tool post 29 and issecured in place by means of a set screw 31, said set screw also servingas means to hold the tool post in adjusted position. The tool post isformed near its lower end with an annular groove to receive the innerflanges of the carriage 2st, and a washer 32 mounted upon the tool postis confined between the cutting tool 80 and the carriage.

WVhen it is required to dress or true the commutator of adynamo-electric machine the brushes are removed and the arms 10 aresecured to the rockers or other convenient portion of the machine bymeans of the fastenings 12, the uprights 1 being adjusted so as to restupon the surface or bed and thereby hold the rods 8 and the partsmounted thereon in operative position. The cutting tool 30 is adjustedso as to remove a sufiicient amount of the commutator to true the same.After the parts have been adjusted the commutator is rotated and thecutting tool is moved across the same by turning the feed screw It willthus be understood that it is not necessary either to remove thecommutator or to displace the machine from its mountings, hence thecommutator may be trued in a comparatively short time and withoutentailing an extra amount of work such as necessitating removing thecommutator or the machine from its mountings.

It is observed that the construction of the device is such as to admitaccurately truing the commutator throughoutits length, both at the endsand at intermediate points, which is of great advantage particularly inthe readjustment of the brushes and in the efliciency of the machineafter the commutator has been dressed.

Having thus described the invention, what is claimed as new is: g

1. The combination of arms carried by a machine as specified, rodsoutwardly extended from said arms, uprights adjustably secured to saidrods, a transverse rod supported across said rods, a head carried bysaid transverse rod, a guide on said head, a carriage mounted in saidguide and a cutting tool carried by said carriage for engagement with anarmature disposed upon the machine.

2. In a machine of the character set forth, the combination of uprights,a tie rod adjustably connecting the uprights, a rod adjustably mountedin one of the uprights and provided with an arm for attachment to thework, acoupling mounted upon said rod, a second rod adjustably mountedin said coupling and provided with a head, a rod adjustably connectedwith said head, and supported by the other upright and having an arm tobe attached to the work, a guide adjustable upon said head, and acarriage mounted upon the guide and provided with a cutting tool.

3. In a machine of the character specified, the combination of uprightseach comprising members and turn buckles for adjustably connecting saidmembers, a tie rod adjustably connecting said uprights, a rod mounted inone of said uprights and provided with an arm to be connected with thework, a coupling mounted upon. said rod, a second rod adjustably mountedin the coupling and provided with a head, a third rod adjustably mountedupon said head and provided with an arm to be connected to the work andsupported by the other upright, a guide mounted upon said head, and acarriage mounted upon the guide and provided with a tool carriage.

4:. In a machine of the character set forth, the combination of asupport provided at its upper end with spaced sleeves, a rod adjustablymounted in one of said sleeves, and adapted to be connected to the work,a coupling mounted upon said rod, a second rod adjustably mounted in thecoupling and provided at one end with a head, a third rod adjustablymounted upon said head and adapted to be connected to the work, andmounted in the other sleeve, a guide mo'unt ed upon the head, and acarriage mounted upon said guide and provided with a cutting tool.

In testimony whereof I afiiX my signature in presence of two witnesses.

OSMAN l1 HUNT. [1 s] lVitnesses S. H. VVILLIAMsON, SYLvEsTnR FLYNN.

